Add ability to estimate the size of a PropertyMap

service/datastore/size_test.go

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package datastore
+
+import (
+        "bytes"
+        "fmt"
+        "sort"
+        "strings"
+        "testing"
+
+        "github.com/luci/gae/service/blobstore"
+        . "github.com/smartystreets/goconvey/convey"
+)
+
+func mps(vals ...interface{}) PropertySlice {
+        ret := make(PropertySlice, len(vals))
+        for i, val := range vals {
+                ret[i] = mp(val)
+        }
+        return ret
+}
+
+var estimateSizeTests = []struct {
+        pm     PropertyMap
+        expect int
+}{
+        {PropertyMap{"Something": {}}, 9},
+        {PropertyMap{"Something": mps(100)}, 18},
+        {PropertyMap{"Something": mps(100.1, "sup")}, 22},
+        {PropertyMap{
+                "Something": mps(100, "sup"),
+                "Keys":      mps(MakeKey("aid", "ns", "parent", "something", "kind", int64(20))),
+        }, 59},
+        {PropertyMap{
+                "Null":   mps(nil),
+                "Bool":   mps(true, false),
+                "GP":     mps(GeoPoint{23.2, 122.1}),
+                "bskey":  mps(blobstore.Key("hello")),
+                "[]byte": mps([]byte("sup")),
+        }, 59},
+}
+
+func stablePmString(pm PropertyMap) string {
+        keys := make([]string, 0, len(pm))
+        for k := range pm {
+                keys = append(keys, k)
+        }
+        sort.Strings(keys)
+
+        buf := &bytes.Buffer{}
+        _, _ = buf.WriteString("map[")
+        for i, k := range keys {
+                if i != 0 {
+                        _, _ = buf.WriteString(" ")
+                }
+                vals := pm[k]
+                strs := make([]string, len(vals))
+                for i, v := range vals {
+                        strs[i] = v.GQL()
+                }
+                fmt.Fprintf(buf, "%s:[%s]", k, strings.Join(strs, ", "))
+        }
+        _, _ = buf.WriteRune(']')
+        return buf.String()
+}
+
+func TestEstimateSizes(t *testing.T) {
+        t.Parallel()
+
+        Convey("Test EstimateSize", t, func() {
+                for _, tc := range estimateSizeTests {
+                        Convey(stablePmString(tc.pm), func() {
+                                So(tc.pm.EstimateSize(), ShouldEqual, tc.expect)
+                        })
+                }
+        })
+}